I was told by someone on xbox live that was hacking MW2, that he was going to fry my xbox, and I contacted support to have them send it to the appropriate parties, because he was actually breaking the law.. So hah? I win? with just a little calm rage.

Actually, It is probably impossible through an XBOX but a bad virus could fuck up your motherboard on your pc.

Other than that, he said he's been banned before but he's just gotten things to unban him so that will be perm ban.
The fact that he used a mod to mod his xbox to make the hack on MW2 could technically get him a System Ban meaning no account could be used on his xbox and the xbox alone would just not be able to be used on live.